hello,
i bought a bike speedometer, but i wish to adapt it into a more complex tooly with a microcontroller, the problem is that i can't identify at all the sensor, because it's not powered (7 wires only, cannot see picture) but it gives me voltage when the magnet aproachs. as i know there are magnetic sensors who works as switches but this gives me voltage... it's a little confusing. it give me peaks of 12V ! -i did the measures without powering it to the speedometer, -
i think all what i have to do to interface a MCU to it is use a diode fectifier and convert it to DC now use OPamp stages to bring the voltage level to my desired ADC range and calibrate it.